.left {
  width: 160px;
  position: absolute;
  left: 10px;
  top: 0px;
  bottom: 0;

  background: linear-gradient(
    to bottom,
    RGBA(255, 255, 255, 0.5),
    RGBA(255, 255, 255, 0) 25%,
    RGBA(255, 255, 255, 0) 75%,
    RGBA(255, 255, 255, 0.5)
  );
  z-index: 333;
}
.right {
  width: 160px;
  position: absolute;
  right: 0;
  top: 0px;
  bottom: 0;
  background: linear-gradient(
    to bottom,
    RGBA(255, 255, 255, 0.5),
    RGBA(255, 255, 255, 0) 25%,
    RGBA(255, 255, 255, 0) 75%,
    RGBA(255, 255, 255, 0.5)
  );
  z-index: 333;
}
